Device for automatically stopping feed-water pumps.



A. R. TRIST. DEVICE FOR AUTOMATICALLY STOPPING FEED WATER PUMPS.

APPLICATION FILED MAY H, T915- 1 ,1 87, l 1 2. Patented June 13, 1916.

Tm: COLUMBIA PLANOGRAPH CO., WASHINGTON, I). c.

ARTHUR RONALD TRIS T, OF LONDON, ENGLAND.

DEVICE FOR AUTOMATICALLY STOPPING FEED-WATER PUMPS.

Specification of Letters Patent. Patented June 13, 1916 Applicationfiled May 11, 1915. Serial No. 27,316.

To all whom it may concern:

Be it known that I, ARTHUR RONALD Tnrs'r, subject of the King of GreatBritain and Ireland, residing in the city of London,

England, have invented new and useful Im provements in Devices forAutomatically Stopping Feed-Water Pumps, of which the following is aspecification.

This invention relates to improvements in governing devices forautomatically controlling the supply of feed water to steam boilers andfor like purposes of the type claimed and illustrated in thespecification of the application filed by me under Serial No. 8447 55and date the 12th of June 1914 and refers to a modification in theconstruction of the differential regulator described therein. I

The object of the invention is to provide means by which the pump orother pressure producing device can be brought to and maintained in astationary condition in the event of the pressure in the main fallingbelow a certain amount. It has been found in practice that where such aregulator is used to control the operations of a pump for producinghydraulic pressure, should a pipe or other device fracture or from someother cause the pressure in the hydraulic main suddenly drop, the pumpunder such circumstances would be suddenly allowed to run away withaconsequent risk of mechanical break down on the one hand and on theother hand of a grave possibility of flooding.

To carry the invention into effect I arrange a detent which will co-actwith the cont rol device (such as the steam valve) and is adapted to benormally kept out of operation by a yielding force such as a weight or aspring. When however the power device is allowed to return under its ownspring owing to the drop in pressure and has reached a predeterminedpoint in its travel it engages with said detent and moves it into theposition of closing the steam valve and maintaining it in such aposition until again released by hand or by pressure coming on the mainagain by the operation of the pump by an independent source of steamsupply.

Referring to the drawing which forms part of this specification andwhich shows the upper part of a governor of the type hereinbeforereferred to with this invention Copies of thin patent may be obtainedfor five cents each, by addressing the "Commissioner of Washington, D.G.

applied thereto, the rod 66 of the power device which has an adjustableyielding resistance such as a spring 6 is provided with an adjustablecollar 0. Upon a fulcrum pin d carried by the frame of the governor ispivotally mounted a detent lever e which is stressed by a spring orother elastic or yielding force. 7 The lower end of the lever e is ofcurved shape so as to engage with the collar 9 at the upper end of thespindle h controlling the steam pump. The lever 6 also carries a pin orroller j which lies in the path of the collar 0. When thepressure goesoff the power device the spring 2) causes the collar 0 to rise andcontacting with the roller or pin 9' draws the lower end of the lever einto the position indicated in dotted lines so that it contacts with thecollar g and-forces down the spindle It and stops the steam pump. Whenthe pressure'comes on the main again the collar 0 moves downward andallows the spring f to withdraw the lever c and permits thespindle it toput the pump again into motion; but until the lever e is withdrawn fromits operative position and thus returned to the position indicated infull lines in the drawing by hand or steam is admitted to the pump bysome independent means such as a bypass, the spindle h is kept in alocked Position. When the proper pressure is on the main the lever e isquite inoperative.

I claim:

In combination with a pressure controlled governing device of the typedescribed, hava ing a controlling spindle, a fixed support, a movabledetent, .cam shaped as to its lower portlon, pivoted intermediate of itsends upon said fixed support, a collar on the up-- ARTHUR RONALD TRIST.

lVitnesses:

RIPLEY WILsoN, CHAS. R. BULLOUGH.

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